Question
A number 777....7 containing 77 sevens is divisible by?
Answer: Option D
:
D
777....7 (77 times) is not necessarily divisible by any multiple of 7.
Option (a) is rejected as the given number cannot be divisible by even multiples of 7, since the number is odd.
Option (b) is rejected as the number is not divisible by 21 as the sum of the digits is not divisible by 3.
Option (c) is also rejected as the number is divisible by 11 only if there are even number of 7s.
Thus, it is evident that option (d) is the correct answer choice.
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:
D
777....7 (77 times) is not necessarily divisible by any multiple of 7.
Option (a) is rejected as the given number cannot be divisible by even multiples of 7, since the number is odd.
Option (b) is rejected as the number is not divisible by 21 as the sum of the digits is not divisible by 3.
Option (c) is also rejected as the number is divisible by 11 only if there are even number of 7s.
Thus, it is evident that option (d) is the correct answer choice.
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